<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>Document</title>
    </head>
    <body>
        <button id="getCookie">获取cookie</button>
        <button id="setCookie">设置cookie</button>
        <button id="deleteCookie">删除一个cookie</button>
        <div class="show-cookie"></div>
        <script>

            const domNode = document.querySelector(".show-cookie");
            getCookie.onclick = function () {
                //读
                domNode.innerText = document.cookie;
            };
            setCookie.onclick = function () {
                //写
                document.cookie = "testUid=test;path=/;";
            };

            deleteCookie.onclick = function () {
                const expiresTime = new Date(0).toUTCString();
                //修改cookie或者删除cookie,需要保障path和domain两个值不变。
                document.cookie = `testUid=test;path=/;expires=${expiresTime};`;
            };
        </script>
    </body>
</html>
